Add turn configuration support for assistants

- Introduce a new `turnConfig` field in `AssistantConfig` and `Assistant` models to manage user interaction settings.
- Implement `TurnConfig`, `BargeInConfig`, `VadConfig`, and `TurnDetectionConfig` schemas to define turn management strategies.
- Update the backend to handle turn configuration in the database and during assistant operations.
- Enhance frontend components with a `TurnConfigEditor` for configuring turn settings, including VAD and barge-in strategies.
- Modify existing pages to integrate turn configuration, improving user experience and interaction capabilities.

backend/routes/assistants.py

@@ -137,6 +137,7 @@ async def _to_out(session: AsyncSession, assistant: Assistant) -> AssistantOut:
         runtime_mode=assistant.runtime_mode,  # type: ignore[arg-type]
         greeting=assistant.greeting,
         enable_interrupt=assistant.enable_interrupt,
+        turn_config=assistant.turn_config or {},
         vision_enabled=assistant.vision_enabled,
         vision_model_resource_id=assistant.vision_model_resource_id,
         model_resource_ids=await _resource_ids(session, assistant.id),
@@ -202,6 +203,7 @@ async def duplicate_assistant(
         runtime_mode=source.runtime_mode,
         greeting=source.greeting,
         enable_interrupt=source.enable_interrupt,
+        turn_config=dict(source.turn_config or {}),
         vision_enabled=source.vision_enabled,
         vision_model_resource_id=source.vision_model_resource_id,
         knowledge_base_id=source.knowledge_base_id,